Active Filter in Applications to Headsets

• Main Authors: Chih-Hua Huang, 黃志華
• Other Authors: Chin-E Lin
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/27804858445315257265

碩士 === 國立彰化師範大學 === 電機工程學系 === 93 === This thesis is concerned with the analysis and design of a feedforward active noise reducing headset. By means of active noise control (ANC) theory, the noise reducing headset can be implemented. Active noise reducing headsets are used to protect professionals in noisy environments, such as aircraft cabins, machine rooms, heavy vehicles and army vehicles. Design of the noise reducing headset includes two dynamic microphones, one amplifier, one trumpet, and the TMS320C6711 DSK. Because considering that the ageing and propagation delay of electronic elements, we adopt the FXLMS algorithm. The FXLMS can compensate secondary path effect effectively. Experimental results show that the noise reducing headset can attenuate the low frequency noises. Furthermore, the design of feedforward controller can deduce the broadband rand noise and periodic noise effectively.